Keithley 7709, User Manual, Page: 18 / 33

15
Row daisy-chain connections
Row daisy-chain ribbon cable assembly
WARNING When using IDC ribbon cable, DO NOT exceed 42V anywhere in the test system or to
the front panel inputs of the Model 27xx.
A convenient method to daisy-chain the rows of two or more Model 7709s, is to use a 25-conductor ribbon cable assembly
with IDC ribbon cable connectors attached to it. For the Model 2700/2701, a two-connector ribbon cable assembly will daisy-
chain two matrix modules. For the Model 2750, a five-connector ribbon cable will daisy-chain five matrix modules.
Refer to Figure 12 and perform the following steps to build a row of daisy-chain cable:
1. Start with an appropriate length of 25-conductor IDC ribbon cable. For the Model 2700/2701, a 3
½
” length of cable is need-
ed. For the Model 2750, a 20
¼
” length is needed.
2. Mark the locations for the IDC connectors on the ribbon cable.
3. Starting at the left end of the cable, attach an IDC connector.
Figure 12
Row daisy-chain ribbon cable assembly
Model 2700/2701:
Model 2750:
25 Conductor IDC Ribbon Cable (KI part #15025):
Model 2700/2701 – 3.5 inch length required.
Model 2750 – 20.25 length required.
25-pin Male D-shell IDC Connector:
Model 2700/2701 – Two connectors required.
Model 2750 – Five connectors required.
Required Parts:
Brown
Insulator
Brown
Insulator
2-1/8 in.
20-1/4 in.
2-1/8 in. 2-1/8 in. 5/8 in.
2-1/8 in.
3-1/2 in.
11-3/8 in.
5/8 in.